PARAM, SRCOMPS

Comments

1. The Strength Ratios that are output as a result of PARAM, SRCOMPS, YES depend on the specified Failure Theory. The following equations show the relationship between the Failure Index and the Strength Ratio for different Failure Theories.
   • Hill Failure Theory:
     $$\mathit{Strength}\hspace{0.17em}\mathit{Ratio}=\frac{1}{\sqrt{\mathit{Failure}\hspace{0.17em}\mathit{Index}}}$$
   • Hoffman Failure Theory:

     There is no direct relationship between the Strength Ratio and Failure Index (refer to Composite Laminates in the User Guide for more information). OptiStruct solves the quadratic equation to find the strength ratio.

   • Tsai-Wu Failure Theory:

     There is no direct relationship between the Strength Ratio and Failure Index. (refer to Composite Laminates in the User Guide for more information). OptiStruct solves the quadratic equation to find the strength ratio.

   • Maximum Stress (Strain) Failure Theory:
     $$StrengthRatio=\frac{1}{FailureIndex}$$
   • Transverse Shear Failure Theory:
     $$StrengthRatio=\frac{1}{FailureIndex}$$
   • Cuntze Failure Theory:
     $$StrengthRatio=\frac{1}{FailureIndex}$$